Microwaves work because very short, high-frequency electromagnetic radiation - around 2.5 gigahertz - are generated from the standard AC current. When you cook food, sugar, fat, and water molecules absorb microwaves at that frequency, which causes the molecules to vibrate at high speeds. Wasted energy in the form of heat cooks the food.
Non-reactive, non-metal materials like ceramic, plastic, or glass do not absorb microwaves at that frequency as efficiently, which, in turn, does not heat up in the microwave as much. However, metal reflects the microwaves causing them to jump erratically, possibly damaging the interior of the microwave because microwaves at some frequencies cannot escape.
Some companies like @hotpockets
took advantage of this thought to produce something called a susceptor, a thin metal sheet that absorbs the microwaves to convert it into heat, leaving the crust in your Hot Pocket golden brown. .
Side note: It is better to leave a spoon in a microwave than a fork, even though you should not put in either. Leave a comment as to why.
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